/* 导航条 */
body{
    background-image: url(../img/背景1.jpg);
    background-repeat: no-repeat;
    background-position: 100%;
}
.nav{
    height: 50px;
    background:black;
    opacity: 0.5;
}
.btil{
    float: right;
    width: 100px;
    line-height: 50px;
    text-align: center;
    margin-right: 200px;
}
.btil .droplist{
    position: absolute;
}
.navlist a{
    color: rgb(67, 209, 228);
    display: block;
}
.navlist a:hover{
    background: gray;
}
.droplist{
    width: 100px;
    background: rgb(76, 73, 73);
    box-shadow: 0 1px 2px rgb(148, 147, 147);
    display: none;
}
.btil:hover .droplist{
    display: block;
}